Controlling device for motor-driven sewing machines



Nov. 11. 1924. 1,514,605

F. DIEHL CONTROLLING DEVICE FOR MOTOR DRIVEN SEWING MACHINES Filed Nov. 11, 1922 6 2 Sheets-Sheet l I In WITNESSES: INVENTOR QM 1 J WML Nov. 11 1924; 1,514,605

F- DIEHL CONTROLLING DEVICE FOR MOTOR DRIVEN SEWING MACHINES Filed Nov.

11, 199:2 2 Sheets-Sheet 2 INVENTOR WITNESSES: f

MMM WIQ W ATTORNEY Patented Nov. 11 1924.,

teen-hem eet LIZABET NEW fle hseIhihe he he :h LANW PATENT FAGTUBING F .eohmeeetet he the JER E e mhohhm BE-WCE the ewe-WHE WIM hp eetieh fi e .h vembe' 9 2- fi cia .NQ- 0%.

To aZZ whom it may concern:

B it kn n theit I, REDER CK D I Citizen o h. t d St es; .reSid -ne ht Eliiebeth. in the county of nion and Stete of New Jersey, he ve invented certein new and useful Improvements in (lontr olling Devices for Motor-Driyen' Sewing of w h t f ll wing s ne ifihetiqh, reference being had therein to the te ecom- Den ng ra n This nyentioii relates to controlling dei e f el t i ll driy n twi e m ines and has for an object to proyide a comv bined motor-controller and sewing nechine ak n atte hih h eh may h he hhled 0 crates electrically in the motor circuit to control the speed of the motor.

Anotherobj ect of the invention is to pro-c vide e sewing machine driving attachment which is inexpensive to manufacture and inst'ell end which is efiicient in operation.

Still further, the invention tor an ,object to provide e combined motor-controller and machine b ak n tachm nt f hempact end simplified construction.

Further objects of the invention Will apn h r m h f l wi d s p i n nd claims.

In the accompanying drawings, ig- 1 represents a tregmentery side eleyetion of a sewing machine to which is applied en attachment embodying the invention. Fig. 2 i8 P 1 iew f he attachment, F g- 3 is i-l d elev t hh f a sewin hihe w th e h eshmen epplii 't e ht Fig. .4 is a View of the operating tread-1e and F 5 is a horizontal "section through the attachment. l i V In the preferred embodiment of the invention, as illustrated, 1 represents a sew,- ing machine table or tabletop on which is stationed an ordinary sewing gnechine or sewing head having 'a; bed 2 find gooseneck 3 in which is journaled the mztin-shaft 9: t0 which i nnec e by the lh tal thumbt p r d clut h 5 th .hel h ewhe 6 having a groove for the belt V The Inah h 'i dr en y hs f i elec ic mo e which s P ra y o n d a th 'uhder i o th ta -t p 1 eh ih lhhle a them:- h ft 9 arryi g a he t pu l y 0 for h et 7. I I i h c ntr lin unit hrefeit hly cehhpriees h ca ing 11 av ng fee 12 firmed with h les is r s where y t e cas ng may h scr wed to t e upper i e th tam -mp under h b lance-wheel (it, M hhted 1 1. a i g 1 is a l t c contro ler eleme 14 ijn hb y in the t rm of h rheqstet such as disclosed in the pz tent of Ze r sh NQ- $3 1629, of Decembe 22; rhehste f this yp be ng else disclosed in y Ph eh No- 136 ,45 7; b Ee ruy 22, 1 -21. Thi rh hstzit chmpr ses th usual body or support carrying elset of re i er ne te eht t h iht 'lha he ppe most v0 whi is n t i m ted t0 th refi hc W n g and is Plead P in O er h he me Po nts 15 P ay t hteet a m 16 Which is pivoth v m nted 0121 1 rheostat body t 1-7. The contect arm 1.6 has n o wa dly al g its sid dges the 9P P sed che k piec s 8 I orm ng be ween them a chennel-Wey 1 9 in which is receiized a oller 20 carried by the lateral errn 21 idly connected o l e 22 fixed to the d -1 d 2 wh PhSSQ ve i ally throu h a ng 11 and P ieets abev th lat er- Th lid -rod 23 is surrou de W thin h e e ll y a l pr ng 2 di$P Q$d be: ttveen the sleeve 22 end the bottom We -ll the casing 11. Thisspri e be slideding ed 23 upward y and S in li e i fih Mih '16 to s ef hoeitihxik F et ed h as l the threaded upper end of the slide-rod 23 is a stop-nut 25 and lock-nut 26; the former of which is adapted to strike the leather or felt stop washer 27 resting on a boss 27 of the casing 11 through which the rod passes, thus limiting the downward movement of the slide-rod.

The casing 11 is formed with an upstand ing post 28 to the bifurcated upper end of which is pivoted at 29 a brake-arm 30 fitted with a brake-shoe 31 adapted to bear upwardly against the periphery of the balance-wheel 6. The brake-arm 30 is formed with a lateral lug 32 in which is screwed the abutment screw 33 the head of which is in engagement with the upper end of the slide-rod 23. The screw 33 is adjustable in the lug 32 and is locked in adjustable position by means of the lock-nut 34. The rheostat 14 is electrically connected, as usual, to the motor circuit by means of the wires 35.

The slide-rod 23 may be connected for manual control by extending a rod 36 from its lower end to the heel-and-toc operated treadle 37. Pressure on the toe or upper edge 38 of the treadle will cause the rod 23 to be pulled downwardly, first relieving the brake and then starting the motor, the speed of which will depend upon the extent to which the toe edge of the treadle is depressed. Pressure upon the heel edge 39 of the t-readle will shift the controller to off position and forcibly apply the brake. The operator may depend upon the spring 24 to stop the machine instead of pressing on the heel edge of the treadle. A quicker stop may, however, be secured by the operator in assisting the action of the spring 24.

A bobbin-winder 40 of the usual type disclosed for example in my Patent No. 1,455,- 391, of May 1.5. 1923, may be mounted on the casing 11 in position for its friction pulley 41 to be shifted into engagement with the rim of the balance-wheel 6. The open side of the casing 11 may be closed by means of a cover-plate 4:2.

It will be noted that the casing 11 carries the controller 14, brake 30 and bobbinwinder 40. These parts may, therefore, be assembled on or in the casing in correct cooperative relation at their place of manufacture, to be afterward applied to a sewmg machine by merely screwing the assembly as a unit to the table-top 1 under the sewing machine balance-wheel 6. By virtue of this provision, it becomes a simple matter to convert an ordinary foot power machine into an electrically driven machine; the services of a skilled mechanic not being requlred, as no careful relative location or coordination of the parts is required after the device leaves the factory. It is merely necessary to'apply the controller as a unitary assembly to the sewing machine. The controller and brake are closely and rigidly related and are unlikely to get out of adjustment or to require the attention of the operator to keep them in operative condition.

ITaving thus set forth the nature of the invention, what I claim herein is l. A controlling attachment for motordriven sewing machines comprising a casing, a variable resistance element detachably mounted as a unit within said casing and including a support, a plurality of resistor connected contact points and a shiftable contact arm carried by said support, a brake- ]ever fulcrumed upon and exteriorly of said casing, and a treadle-operated rod connected at separated points to said shiftable contact arm and brake-lever.

2. A controlling attachment for motordriven sewing machines comprising a casing having spaced top and bottom walls, a slide-rod passing vertically through said casing and having bearings in said top and bottom walls, a variable resistance unit mounted within said casing and including a shiftable contactor operatively connected to the portion of said slide-rod within said casing, and a brake disposed on top of said casing and operatively connected with the exposed upper end of said slide-rod.

3. A controlling attachment for motordriven sewing machinescomprising a casing having spaced top and bottom walls, a slide-rod passing vertically through said casing and having bearings in said top and bottom walls, a variable resistance unit mounted within said casing and including a shiftable contactor operatively connected to the portion of said slide-rod within said casing, a brake disposed exteriorly of and above said casing, and an adjustable connection between said brake and the exposed upper end of said slide-rod.

4-. A, controlling attachment for motordriven sewing machines comprising a casing having spaced top and bottom walls, a sliderod passing vertically through said casing and having bearings in said top and bottom walls, a variable resistance unit mounted within said casing and including a shiftable contactor operatively connected to the portion of said slide-rod within said casing, and a brake-lever fulcrumed exteriorly of and above said casing and resting by gravity upon the upper end of said rod.

5. A controlling attachment for motordriven sewing machines comprising a casing having vertical side walls, a top wall, and a flat base adapting said casing to be mounted on a sewing machine table-top, a variable resistance unit comprising a supporting body detachably mounted on one side wall of and within said casing and carrying a plurality of resistor connected contact points and a shiftable contact arm adapted to play vertically over said contact points, a treadle- Lee muses operated rod passing vertically through and slidably mounted in said easing the upper end of said rod projecting through the top Wall of said casing, an operative connection Within said casing between said slide-rod and said shiftable contact-arm, a brake-lever pivotally mounted on top of said casing, and

an operative connection between said brakelever and the exposed upper end of said slide-rod.

In testimony whereof, I have signed my name to this specification.

FREDERICK DIEHL. 

